Analisis Pengujian Shielding Effectiveness Menggunakan Antena Loop pada Frekuensi Rendah

Abstract

Environmental exposure to electromagnetic fields continues to increase along with technological advances. Electronic devices now mostly produce Electromagnetic Interference (EMI). EMI can be interfered with (conducted) and air (radiated) One way to reduce emissions from electromagnetic devices is by adding electromagnetic shielding. The material's ability to reduce electromagnetic fields in space by blocking shielded fields is called shielding effectiveness. In this study, pre-compliance shielding effectiveness was tested using Rx and Tx loop antennas. Tests were carried out on four different types of materials, namely copper sheet, EMI absorber, aluminum sheet and aluminum foil. Test parameters are material conductivity, material distance and single layer or double layer. After testing it is known that aluminum 0.25 mm thickness is  more effective for reducing EMI compared to 0.05 mm aluminum foil material. This is due to the influence of different thicknesses between aluminum 0.25 mm and aluminum foil 0.05 mm thickness. The 0.1 mm copper material has a higher shielding effectiveness than the 0.1 mm EMI absorber material with a difference of 1.17 dB, testing at a frequency of 800 kHz. Although the copper thickness and EMI absorber are the same, the copper conductivity value is greater than the EMI absorber material which is . This causes the copper shielding effectiveness value to be higher than the EMI absorber material.